Understanding FAN speed/control

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Hello,

Motherboard: asrock z390m-itx/ac

I recently added two noctua fans in the bottom of my case. I entered my bios to confirm they were detected and working. I have played with the system for a day of two and everything works as it should

For some reason I wanted to see what the Fan Turning option did and didnt realize it said - Detect the lowest fan speed in the system - in the description.

The system did a - Detecting your fan speed - and I had to wait.
When it was finished it said:
Cpu fan 1 minimal duty = 20%
Chassie fan 1 minimal duty = 25%
Chassie fan 2 minimal duty = 20%
Can someone explain what this means?

Ever since I pressed that option I have noticed my PC generates more noise, even at idle! Now, it annoys me that I can hear it compared to before!
I have pressed the Load default uefi setting and it still does it.
All of the fans er set to standard.

My FAN setting:
CPU FAN 1 Setting - Standard mode

CHA_FAN1 /W_PUMP Switch - CHA_FAN1
Chassis FAN 1 Control Mode - Auto
Chassis Fan 1 Setting - Standard Mode
Chassis Fan 1 Temp Source - Monitor M/B

Chassis Fan 2 setting - Standard Mode
Chassis Fan 2 Temp Source - Monitor M/B

CPU temp at IDLE is 48C and Motherboard at 43C

I wonder i the person before me did a fine tune of the system but I?�?pretty sure everything was at default /stock.

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Dice Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 20 Mar 2020 Status: Offline Points: 3	Post Options Post Reply Quote Dice Report Post Thanks(0) Quote Reply Topic: Understanding FAN speed/control Posted: 20 Mar 2020 at 8:05pm
	Hello, Motherboard: asrock z390m-itx/ac I recently added two noctua fans in the bottom of my case. I entered my bios to confirm they were detected and working. I have played with the system for a day of two and everything works as it should For some reason I wanted to see what the Fan Turning option did and didnt realize it said - Detect the lowest fan speed in the system - in the description. The system did a - Detecting your fan speed - and I had to wait. When it was finished it said: Cpu fan 1 minimal duty = 20% Chassie fan 1 minimal duty = 25% Chassie fan 2 minimal duty = 20% Can someone explain what this means? Ever since I pressed that option I have noticed my PC generates more noise, even at idle! Now, it annoys me that I can hear it compared to before! I have pressed the Load default uefi setting and it still does it. All of the fans er set to standard. My FAN setting: CPU FAN 1 Setting - Standard mode CHA_FAN1 /W_PUMP Switch - CHA_FAN1 Chassis FAN 1 Control Mode - Auto Chassis Fan 1 Setting - Standard Mode Chassis Fan 1 Temp Source - Monitor M/B Chassis Fan 2 setting - Standard Mode Chassis Fan 2 Temp Source - Monitor M/B CPU temp at IDLE is 48C and Motherboard at 43C I wonder i the person before me did a fine tune of the system but I?�?pretty sure everything was at default /stock.